Accueil >
Production scientifique
Chimie et Matériaux
(13) Production(s) de l'année 2018
|
|
Transport of ions in solution through single-walled carbon nanotubes
Auteur(s): Yazda K., Tahir S., Michel T., Loubet Bastien, Manghi Manoel, Bentin Jérémy, Picaud Fabien, Palmeri J., Henn F., Jourdain V.
Conference: Chemontubes 2018 (Biarritz, FR, 2018-04-22)
|
|
|
Methods for Screening Cloud Point Temperatures
Auteur(s): Pincemaille J., Banc A., Chauveau E., Fromental J.-M., Ramos L., Morel Marie-Hélène, Menut P.
(Article) Publié:
Food Biophysics, vol. 13 p.422-431 (2018)
Ref HAL: hal-01908982_v1
DOI: 10.1007/s11483-018-9548-1
WoS: WOS:000448509200010
Exporter : BibTex | endNote
4 Citations
Résumé: A novel and simple method for the measurement of cloud point temperatures of solutions is presented. Cloud point determination , which is currently used to establish the phase diagrams of protein solutions, is indicative of proteins interactions and constitutes a useful tool for food products engineering. We describe a novel experimental setup that allows screening of a large number of physical-chemical conditions in one measurement and the determination of cloud point temperatures both above and below ambient temperature. We use a simple method to avoid solvent evaporation and condensation, so that the setup can be used for solutions prepared with a volatile solvent. We present the operating parameter range and the precision of the measurement. The optical properties of the system are calibrated with solutions of known transmittance, and the determination of cloud point temperatures is validated on a standard non-ionic surfactant solution. Finally, we demonstrate the efficiency of the method by determining the phase diagram of a wheat protein extract, soluble in a water/ethanol mixture. Complemented with differential scanning calorimetry measurements, the liquid-liquid phase transition can be determined up to a protein concentration of 250 g/L, a range inaccessible with conventional methods for this protein extract.
|
|
|
Dynamics of the S(1D)+o-D2 --> SD+D reaction at low collision energies: revisiting the SH2 system
Auteur(s): Lara Manuel, Chefdeville Simon, Larregaray Pascal, Bonnet L., Launay Jean-Michel, Costes Michel, Naulin Christian, Jambrina Pablo G, Aoiz F Javier, Bergeat Astrid
(Affiches/Poster)
MOLEC 2018 (Dinard, FR), 2018-08-26
|
|
|
Selection of hexagonal buckling patterns by the elastic Rayleigh-Taylor instability
Auteur(s): Chakrabarti Aditi, Mora S., Richard Franck, Phou T., Fromental J.-M., Pomeau Yves, Audoly Basile
(Article) Publié:
Journal Of The Mechanics And Physics Of Solids, vol. 121 p.234 - 257 (2018)
Texte intégral en Openaccess :
Ref HAL: hal-01869797_v1
DOI: 10.1016/j.jmps.2018.07.024
WoS: 000446291200012
Exporter : BibTex | endNote
11 Citations
Résumé: We investigate the non-linear buckling patterns produced by the elastic Rayleigh-Taylor instability in a hyper-elastic slab hanging below a rigid horizontal plane, using a combination of experiments, weakly non-linear expansions and numerical simulations. Our experiments reveal the formation of hexagonal patterns through a discontinuous transition. As the unbuckled state is transversely isotropic, a continuum of linear modes become critical at the first bifurcation load: the critical wavevectors form a circle contained in a horizontal plane. Using a weakly non-linear post-bifurcation expansion, we investigate how these linear modes cooperate to produce buckling patterns: by a mechanism documented in other transversely isotropic structures, three-modes coupling make the unbuckled configuration unstable with respect to hexagonal patterns by a transcritical bifurcation. Stripe and square patterns are solutions of the post-bifurcation expansion as well but they are unstable near the threshold. These analytical results are confirmed and complemented by numerical simulations.
|
|
|
Chemical & Nano-mechanical Study of Artificial Human Enamel Subsurface Lesions
Auteur(s): Al-Obaidi R., Salehi H., Desoutter A., Bonnet L., Etienne P., Terrer E., Jacquot B., Levallois B., Tassery Hervé, Cuisinier Frédéric
(Article) Publié:
Scientific Reports, vol. 8 p.4047 (2018)
Texte intégral en Openaccess :
Ref HAL: hal-01767245_v1
DOI: 10.1038/s41598-018-22459-7
WoS: WOS:000426643600011
Exporter : BibTex | endNote
4 Citations
Résumé: White lesions represent an early phase of caries formation. 20 human sound premolars were subjected to pH cycling procedure to induce subsurface lesions (SLs) in vitro. In addition, 2 teeth with naturally developed white spot lesions (WSLs) were used as references. All specimens characterized by confocal Raman microscopy being used for the first time in examining white & subsurface lesions and providing a high resolution chemical and morphological map based on phosphate peak intensity alterations at 960 cm−1. Nanoindentation technique was used to measure Hardness (H) and Young’s modulus (E) of enamel. Phosphate map of examined samples exhibited presence of intact surface layer (ISL) followed by severe depletion in (PO43−) peak in the area corresponding to the body of the lesion. In all examined groups, the mechanical properties of enamel were decreased in lesion area and found to be inversely related to penetration depth of indenter owing to enamel hierarchical structure. By combining the above two techniques, we linked mechanical properties of enamel to its chemical composition and ensured that the two methods are highly sensitive to detect small changes in enamel composition. Further work is required to bring these two excellent tools to clinical application to perceive carious lesions at an early stage of development.
|
|
|
Impact of Beads and Drops on a Repellent Solid Surface: A Unified Description
Auteur(s): Arora S., Fromental J.-M., Mora S., Phou T., Ramos L., Ligoure C.
(Article) Publié:
Physical Review Letters, vol. 120 p.148003 (2018)
Texte intégral en Openaccess :
Ref HAL: hal-01761380_v1
DOI: 10.1103/PhysRevLett.120.148003
WoS: 000429451000016
Exporter : BibTex | endNote
5 Citations
Résumé: We investigate freely expanding sheets formed by ultrasoft gel beads, and liquid and viscoelastic drops, produced by the impact of the bead or drop on a silicon wafer covered with a thin layer of liquid nitrogen that suppresses viscous dissipation thanks to an inverse Leidenfrost effect. Our experiments show a unified behavior for the impact dynamics that holds for solids, liquids, and viscoelastic fluids and that we rationalize by properly taking into account elastocapillary effects. In this framework, the classical impact dynamics of solids and liquids, as far as viscous dissipation is negligible, appears as the asymptotic limits of a universal theoretical description. A novel material-dependent characteristic velocity that includes both capillary and bulk elasticity emerges from this unified description of the physics of impact.
|